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As the investigation proceeds, there are a couple of rookie mistakes to watch out for, as even experts sometimes fall into these traps:
1) When analyzing actions and decisions of people over time leading up to an accident, it is unfair to apply your present "perfect" knowledge of what happened. You must "walk the timeline" shoulder to shoulder with those people and assess their actions and decisions with what they knew at that moment in time. Doing the latter can uncover root-cause defects that might otherwise remain undetected.
2) Be careful of firm, unyielding comments about how the systems worked leading up to the accident; e.g., "when you flip this switch, this IS what happened". Everything in the system behavior should now be suspect until the root causes have been identified and fixed; design specifications, test procedures, training, and user documentation has been updated to accommodate new knowledge; and the entire avionics system has been re-validated, i.e., has been shown to meet all design specifications by generating objective evidence from testing, simulations, inspections, and reviews.